ANSWER: Yes, they must redo the wudu before praying but this has no impact on your ghusul. 

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ANSWER: The maximum is 3 times, you must not exceed that. You are sinful for exceeding that but this doesn’t make your wudhu invalid. 

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ANSWER: No problem in making wudu there. You can say Bismillah before you enter the bathroom or say it in your heart before making wudu.

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